Need to connect my electronic Actron tach to do some carburetor and idle speed adjustment fine-tuning. In the past, you’d hook one tach lead to the ignition coil negative terminal (if memory serves). But since that time, I upgraded the ignition to the GM HEI setup and now I’m unsure where that tach lead gets hooked. I followed the excellent HEI conversion procedure write up from SSDan on this site.

Who can tell me where it goes now?

terminal b on the coil. there is an excellent picture in dan's article

Thank you. I haven't re-read that article in awhile.

you're welcome.
i kinda thought you might have not gone back lol